Comment # 15 on bug 1206703 from Takashi Iwai

Thanks for the detailed information.

Interestingly, there is no significant difference between working and broken
alsa-info.sh outputs.  The problem must be something deep...

Fortunately, SLE/Leap kernel is kABI compatible, and you can swap modules.
Could you try to copy the good-working *.33 sound modules into *.38 updates
directly and see whether it changes the behavior?  e.g. run like below as root:

  # mkdir -p /lib/modules/5.14.21-150400.24.38-default/updates
  # cp -r /lib/modules/5.14.21-150400.24.33-default/kernel/sound
/lib/modules/5.14.21-150400.24.38-default/updates
  # depmod -a 5.14.21-150400.24.38-default
  # reboot

After booting *.38 kernel, check the output of "modinfo snd", and verify the
path is in */updates/sound/*.

Once after testing, you can go back to the clean state just by removing (the
formerly copied) /lib/modules/5.14.21-150400.24.38/updates/sound directory, run
depmod, and reboot.
You can try other modules similarly to find out what module(s) caused the
problem, too.